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The type property is read-only, whereas the multiple property is read-write. Setting the multiple property of the select object to 'multiple' will have the same effect as adding the attribute multiple="multiple" in the select tag (note: multiple="multiple" is the sanctioned syntax for this attribute).

Be aware that messing with this property will flat-out crash some browsers.

The type property is read-only, whereas the multiple property is read-write. Setting the multiple property of the select object to 'multiple' will have the same effect as adding the attribute multiple="multiple" in the select tag (note: multiple="multiple" is the sanctioned syntax for this attribute).

Be aware that messing with this property will flat-out crash some browsers.

If you use the syntax I suggested, it will work in IE as well. It will crash at least some versions of Konqueror and Safari. It does not appear to do anything in Opera.

A potential work-around that would likely provide more universal functionality would be to create two identical selects in the markup, one with multiple and one without and toggle their display values between none and inline.